Alleged Santa Fe shooter indicted by Galveston County...

1of35Dimitrios Pagourtzis, 17, is charged with capital murder and a first degree felony charge of aggravated assault on a peace officer.Photo: Galveston County Jail

2of35Photos taken from the Facebook page of Dimitrios Pagourtzis, 17, the alleged shooter at Santa Fe High School on May 18, 2018.Photo: Facebook / Facebook

3of35Booking mug of Dimitrios Pagourtzis. He is charged with capital murder and a first degree felony charge of aggravated assault on a peace officer.Photo: Santa Fe Police Department / Galveston County Sheriff's Department

4of35Mourners pray around a memorial in front of Santa Fe High School on May 21, 2018 in Santa Fe, Texas. Photo: Scott Olson, Getty Images

5of35Crosses line the lawn in front of Santa Fe High School on May 21, 2018 in Santa Fe, Texas. Photo: Scott Olson, Staff / Getty Images

6of35Sierra Dean, 16, grieves while visiting the memorial for Kimberly Vaughan, her best friend, in front of the Santa Fe High School Wednesday, May 23, 2018, in Santa Fe in Galveston County. Vaughan, seven other students, and two staff members were killed by alleged shooter Dimitrios Pagourtzis, 17, on May 18.Photo: Godofredo A. Vasquez, Houston Chronicle / Houston Chronicle

7of35Women stop visit the memorial for the eight students and two staff members, who were killed last week, in front of the Santa Fe High School Wednesday, May 23, 2018, in Santa Fe, Texas.Photo: Godofredo A. Vasquez, Houston Chronicle / Houston Chronicle

8of35Portrait of Mark Bratcher, Thursday, July 26, 2018, in Santa Fe, who founded the Santa Fe Community Committee. The committee, which has no officiald ties to the school district, has mobilized parents into action. They have formed research teams, packed board meetings and have organized townhall meetings in an effort to create a communication pipeline between the district and the Santa Fe community at large. Meanwhile a federal investigation into the Santa Fe shooting is ongoing. Photo: Karen Warren, Staff photographer / Houston Chronicle

9of35Karee Carter, Stacy Howard David, Andrea Jewell, and Jamie Zegarelli talk during a board meeting for their new organization Santa Fe Tribe Moms at Zegarelli's home, Tuesday, July 17, 2018, in Santa Fe, TX. The parents have mobilized in the weeks following the school shooting.Photo: Mark Mulligan, Staff / Houston Chronicle

10of35Green and yellow ribbons are tied to columns in front of the Santa Fe Chamber of Commerce along Highway 6, Monday, June 18, 2018 in Santa Fe. A federal investigation into the Santa Fe shooting is ongoing. Photo: Mark Mulligan, Houston Chronicle / Houston Chronicle

11of35PHOTOS: How Houston showed support for Santa Fe
An overwhelming outpouring of support came from all corners of the community to help those affected most by the tragedy.
>>See how neighbors helped neighbors in the photos that follow...Photo: Mark Mulligan, Staff photographer / Houston Chronicle

12of35Students and teachers at Clear Springs High School in League City created and sold 1,200 t-shirts and sold them to other students and teachers, raising $12,000 for the Santa Fe Strong Memorial Fund.Photo: Clear Springs High School

13of35Clear Brook High School tweeted its support for Santa Fe High School on May 24.Photo: Clear Brook High School/Twitter

14of35Clear Brook High School tweeted its support for Santa Fe High School on May 24.Photo: Clear Brook High School/Twitter

17of35The Texas Dirt Divas, a travel softball organization from Liberty, played for Santa Fe at last week's SBL Triple Series softball tournament in The Woodlands.Photo: Katy Bishop

18of35Dakota Mata, a student at Santa Fe Junior High School, dedicated the song "Stand By Me" to her community during a concert at the Kemah Boardwalk on May 26.Photo: Kristie Mata/Facebook

19of35Alvin High School students walk to the Santa Fe High School shooting memorial after welcoming Santa Fe students back to school, Tuesday, 11 days after a shooter killed 10 people. ( Marie D. De Jesus / Houston Chronicle)Photo: Marie D. De Jesus/Houston Chronicle

20of35The Sterling Stars, the dance team at Sterling High School in Baytown, tweeted their support for Santa Fe High School on May 22.Photo: Sterling Stars/Twitter

21of35Manvel High School's Class of 2018 wore green ribbons to commencement in honor of Santa Fe High School.Photo: Manvel High School/Twitter

30of35Students and teachers at Clear Springs High School in League City created and sold 1,200 t-shirts and sold them to other students and teachers, raising $12,000 for the Santa Fe Strong Memorial Fund.Photo: Clear Springs High School

31of35Justin Timberlake closed his Houston concert on May 24, 2018 with a special message for the victims of the May 18 mass shooting at Santa Fe High School in Santa Fe, Texas. Wearing a "Santa Fe Strong" T-shirt, Timberlake told concertgoers "we're gonna light the whole arena, this whole city up for Santa Fe High School." (photo courtesy Adam Busby on Twitter)Photo: courtesy Adam Busby

32of35HOUSTON, TX - MAY 22: Jose Altuve #27 of the Houston Astros wears a shirt that reads "We Play For Santa Fe" remembering the students and teachers killed at Santa Fe High School as they take batting practice before playing the San Francisco Giants at Minute Maid Park on May 22, 2018 in Houston, Texas. (Photo by Bob Levey/Getty Images)Photo: Bob Levey/Getty Images

33of35Houston Astros third baseman Alex Bregman, left, shortstop Carlos Correa, center, and manager AJ Hinch watch during batting practice before a baseball game against the San Francisco Giants, Tuesday, May 22, 2018, in Houston. The Astros are wearing shirts showing their support for the Santa Fe High School shooting victims. (AP Photo/David J. Phillip)Photo: David J. Phillip/Associated Press

34of35Houston Astros center fielder George Springer wears a cross over his t-shirt during batting practice before a baseball game against the San Francisco Giants, Tuesday, May 22, 2018, in Houston. The Astros are wearing shirts showing their support for the Santa Fe High School shooting victims. (AP Photo/David J. Phillip)Photo: David J. Phillip/Associated Press

35of35Rockets owner Tilman Fertitta and his family stand during a ceremony honoring the students, staff and first responders from Santa Fe before the first half of Game 5 of the NBA Western Conference Finals at Toyota Center on Thursday, May 24, 2018, in Houston. ( Brett Coomer / Houston Chronicle )Photo: Brett Coomer/Houston Chronicle

A Galveston County grand jury Thursday indicted the 17-year old Santa Fe High School student accused of killing 10 people in a shooting spree at the school in May.

Dimitrios Pagourtzis, 17, is charged with capital murder and a first degree felony charge of aggravated assault on a peace officer. Pagourtzis was arrested at Santa Fe High School on May 18, the day of the shooting after allegedly killing 10 people and wounding 13, including Santa Fe Independent School District Officer John Barnes.

Nick Poehl, Pagourtzis' attorney, said he was not surprised by the indictment and that he expected a court date to be set sometime over the next month.

"It basically went the way we expected in terms of the charges that were indicted and no additional charges," Poehl said.

Pagourtzis, a junior at Santa Fe High School, admitted to the mass shooting after his arrest, according to court documents. He planted explosives that did not detonate and selected his targets so as to spare the students he liked, he later told police.

Witnesses said Pagourtzis entered the school on May 18 with a long dark trench coat, the same attire as the Columbine High School shooters, concealing what police later identified as his father's sawed off Remington shotgun and .38 pistol.

Pagourtzis allegedly opened fire in an art class, moving through the room shooting at teachers and students, and talking to himself. He approached a supply closet where students were barricaded inside, and he shot through the windows saying "surprise," witnesses said.

During the shooting, Barnes and another officer rushed into Santa Fe ISD High School, where they confronted Pagourtzis.

According to authorities, Pagourtzis fired the shotgun at Barnes. The blast hit the officer's right elbow, shredding veins and bone and sending blood spraying out onto the ground, according to reports.

Barnes spent 18 days at University of Texas Medical Branch Hospital before being discharged in June.

Pagourtzis was 17 when the shooting occurred -- considered a legal adult in Texas -- meaning he is eligible for a life sentence if convicted on the state charges, but theoretically could be eligible for parole in 40 years. He is currently being held without bail in Galveston County Jail.

Grand jury hearings on the Santa Fe shooting began last week. Pagourtzis' parents, Antonios Pagourtzis and Rose Marie Kosmetatos, were among the witnesses that testified to the grand jury.

Pagourtzis' parents are also defendants in a wrongful death lawsuit filed by families of the Santa Fe High School victims, accusing them of permitting their son access to their firearms.

A federal investigation into the Santa Fe shooting is ongoing. The Chronicle reported in May that the Justice Department is considering filing additional charges against Pagourtzis after some of the explosive devices found on Pagourtzis when arrested at the high school -- CO2 canisters wrapped with duct tape -- were found to be functional.

Federal law enforcement could submit separate federal charges if the evidence indicates that the materials that went into making the devices were purchased using a credit or debit card or online and the transactions crossed state lines.

Pagourtzis is being evaluated for competency and sanity by a team of experts. "Competency" in this case is defined as Pagourtzis' current state of mind and ability to stand trial while "sanity" indicates his state of mind at the time of the offense.

Pagourtzis has had only one session thus far, and Poehl said it would take at least three sessions for an initial assessment to be made. Poehl said the assessment would have no bearing on the charges filed on Thursday, but could affect whether Pagourtzis is deemed fit to stand trial.

Nick Powell covers Galveston County for the Chronicle. Follow him on Twitter and send him tips at nick.powell@chron.com